Drill chuck



m fr n e W I 2 sheets-sheet 1 DRILL CHUCK H. H. TALBOYS ETAL oiginal Filed Feb. 1o, 1941 Nov. 27, i945.

Nov. 27, 1945. H. TALBoYs ETAL DRILL CHUCK Original Filed Feb. l0, 1941 2 Sheets-Sheet 2 (l 1 ganar l Invevzzors H6727" jf. 22625 Patented Nov. 27, 1945 2,389,749 FICE DRILL CHUCK Henry H. Talboys and Helmer E.

waukee, Wis., assignors to Erickson, Mil- Nordberg Manufacturing Co., Milwaukee, Wis., a corporation of Wisconsin Original application Febru 378,260. Divided ary 10, 1941, Serial No. and this application January 8, 1942, Serial No. 425,994

Claims.

Our invention relates to an improvement in drills and improved chucks therefor.

One purpose is the provision of an improved drill holder or chuck.

Another purpose is the provision of such a drill holder or chuck in which the drill and chuck may be advantageously held and fed during the drilling operation.

Another purpose is the provision of an improved chuck and bit for rail drills and the like.

Another purpose is the provision of improved means for kicking out or loosening the drill and chuck.

Other purposes will appear from time to time in the course of the specification and claims.

The present application is a division of our Acopending application Serial No. 378,260, led in the United States Patent Oice on February 10, 1941.

We illustrate our invention more or less diagrammatically in the accompanying drawings wherein:

Fig. 1 is an axial section illustrating the chuck and bit in operative position;

Fig. 2 is a section on an enlarged scale on the line 2-2 of Fig. 1;

Fig. 3 is a section on an enlarged scale on the the line 3 3 of Fig. 1 and Fig. 4 is a section on the line 4'-4 of Fig. 1.

Like parts are indicated by like symbols throughout the specification and drawings.

Referring to the drawings, I indicates any suitable member to be operated on, in this instance a rail having a lower flange 2 and an The rail is shown as secured in The details do the present invention but are shown herein to indicate a practical application of our drill and chuck mechanism.

The rail drill structure may include for example frame members in the form of parallel side plates 5, 6, which may be connected for example by a tube 'I at each end and by channel may be welded to the upper anges of the channels 8.

Extending between the tubes 1 are a pair of spaced parallel bars IIJ, II, parallel with the side frame members 5, 6. They may, for' example, be welded to the tubes 1. Extending between the bar II and the side frame member 6 are additional transverse supports or angles I2. Mounted upon the angles I2 are the longitudinally extending motor supporting bars I3, I4, the bar I4 resting also in part upon the support II.

Also welded to the side frame member 5 is the rality of aligning ybearing assembly, including the nat portion 22, carrying at the bottom a horizontal transversely extending cylindrical sleeve 23 for carrying the chuck structure below described. It also carries a bearing sleeve 24, the purpose of which will later appear. Outwardly extending from the flat portion 22 areside webs or walls 26, which are joined at the lower ends to the sleeve 23. Outwardly extending at the opposite sides thereof are the angles 21, to which is secured a housing 28 for housing the below described chain drive.

It will be understood that the frame is roughly centered over one rail or may be supported in that position in any suitable manner, as by any suitable outwardly extending rod, the details of which do not form part of the present invention and are not shown herein. The means for raising, lowering and centering the frame are not indicated in detail, as they do not of themselves form part of the present invention.

Any suitable motor not herein shown may be employed to drive the below described chuck or drill spindle. We illustrate for example sprocket chains 90, which extend to any suitable motor, not shown.

The sleeve or chuck spindle 92 yhas a pair of tapered seats 95, each one of which is semicircular in cross section at the outer end, converging to form a true circle, or its approximation, at the inner end. Separating these tapered seats are lateral enlargements which may be generally arcuate in cross section, shown for example at in Figs. 3 and 4.

91 indicates a flat drill bit which is held between the chuck halves 98, the outer faces oi which conform to the faces of the tapered seats 95 of the spindle 92. The chuck halves 98 'are grooved as at 99 to hold the drill 91 in proper alignment. They are also provided with a pluholes I00, which may receive a limit pin IOI which serves to position the inner end of the bit 9'I. It will be understood that as the bit wears down, the pin IIJI may be advanced successively forwardly along the sequence of aligned holes |00. The chuck assembly is frictionally held in place by the seating of the chuck halves against the opposed tapered faces of the spindle 92.

As a ready means for kicking out the chuck we provide a kickout pin |03, having an enlarged head |04, within the cavity of the spindle 92, to limit its outward movement, and an exterior spring ring |05 to limit its inward penetration, It will be understood that when the drill is in use the pin |03 is not functioning, but a tap or ,push is sufficient to release the chuck by unseating the chuck halves 98, to permit the removal of the chuck for replacement or adjustment oi the bit 91. The side enlargements 96 permit the employment of bits of a Width greater Ithan the diameter of the chuck halves, and of course a smaller bit can also be employed if desired.

In order to feed the drill we provide a dog HU, effective to engage a rail web on a side opposite the drill. It may be of any suitable form, and is provided with any permit the passage of the bit therethrough. The dog I lil is mounted on or forms part of the carriage I l2which has laterally extending pins H3, on which are mounted rollers H4, which ride within the channels 8. We illustrate two pairs of rollers H4, at each end ofthe carriage H2, as shown for example in Fig. l. The carriage H2 is screw threaded upon the worm H5, and may be rotated, for example, by the exterior crank HG, with the handle H1. Any suitable ratchet H8 may be employed for final adjustment and for feeding the drill. It will be understood that the ratchet is reversible, the details not forming of themselves part of the present invention. The worm shaft as a whole is mounted in any suitable ball bearings H9 within the sleeve 25.

It will be realized that, whereas we have described and illustrated a practical and operative evice, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of our invention. We therefore wish our description and drawings to be taken as in a broad sense illustrative or diagrammatic, rather than as limiting us to our precise showing.

We claim:

l. In a drill chuck, a sleeve having an inwardly tapered bore, the inner end of the bore approximating a circular cross section, thecross section of the bore becoming increasingly oval from the inner end of the bore to the outer end,rand denning a pair of diametrically opposed partial bores generally arcuate in cross section, and a pair of tapered chuck halves, each chuck half being generally arcuate 1n exterior cross section but decreasing in radial thickness from the outer to the inner end of the chuck halves, said chuck halves being penetrated by pairs of diametrically opposed apeitures, and an abutment and centering member including an intermediate portion lying between the chuck halves and end members adapted to penetrate opposed apertures in said halves.

2. In a drill chuck, a sleeve having an inwardly tapered bore including diametrically opposed portions the inner surfaces of which are generaily semi-cylindrical, the centers about which said semi-cylindrical surfaces are described being spaced apart and being slightly inclined in relation to each other and diverging outwardly to'- ward the open endof the sleeve, a pair of tapered chuck halves adapted for insertion in said bore, their exterior surfaces being generally rusto-conic and adapted to conform generally to the cylindrical inner surfaces of the bore, one of said chuck halves being adapted slidably to seat in each of said cylindrical surfaces, and a drill limit element extending between said chuck halves and adjustable Vtherealong, said chuck halves and limit element being unitarily and readily removable through the open end of said bore.

3. In a drill chuck, a sleeve having an inwardly tapered bore including diametrically opposed portions, the inner surfaces of which are generally semi-cylindrical, the centers about which suitable aperture Ill to` said semi-cylindrical surfaces are described being spaced apart and being slightly inclined in relation to each other and diverging outwardly toward the open end of the sleeve, a pair of tapered chuck halves adapted for insertion in said bore, their exterior surfaces beinggenerally frusto-conic and adapted to conform generally to the cylindrical inner surfaces of the bore, one of said chuck halves being adapted slidably to seat in each of said cylindrical surfaces, and a drill limit element extending between said chuck halves and adjustable therealong, said chuck halves and limit elements being unitarily and readily removable through the open end of said bore, each said chuck half being provided with a plurality of apertures in which the ends of said drill limit element may penetrate, the length of said drill limit element being less than the smallest diameter of the tapered bore.

4. In a drill chuck, a sleeve having an inwardly tapered bore including diametrically opposed portions the inner surfaces of which are generally semi-cylindrical, the centers about which said semi-cylindrical surfaces are described being spaced apart and being slightly inclined in relation to each other and diverging outwardly toward the open end of the sleeve, a pair of tapered chuck halves adapted for insertion in said bore, their exterior surfaces being generally frusto-conic and adapted to conform generally to the inner suraces of the bore, their opposed inner surfaces being generally parallel with each other and with the axis of the chuck and having opposed longitudinally extending tool gripping channels, one of said chuck halves being adapted slidably to seat in each of said semi-cylindrical surfaces, and a tool limit element extending between saidchuck halves and adjustable therealong, said chuck halves and tool limit element being unitarily and readily removable through 'the open end of said bore.

5. In a drill chuck, a sleeve having an open ended, inwardly tapered bore including diametrically opposed longitudinally extending chuck guiding recesses which are slightly inclined in relation to each other, and diverge outwardly toward the open end of the sleeve, a pair of tapered chuck halves adapted for insertion in said bore, their exterior surfaces conforming gen- @rally to the opposed inner surfaces of said guiding recesses, each of said chuck halves being adapted slidably to seat in one of said guiding recesses, each of said chuck halves having a series of transversely extending apertures spaced along the axis of the chuck, corresponding apertures of the two halves forming aligned pairs, and an adjustable drill limit element transversely extending between said chuck halves and positionable in one of said aligned pairs of apertures, and having end portions adapted slidably to penetrate said aligned apertures, said chuck halves and limit element being unitarily and readily removable as a group through the open end of said bore, the transverse extension of said drill limit element being less than the smallest internal diameter oi bore, and means for preventing transverse movement of said limit element outwardly beyond the outer faces of said chuck halves. HENRY H. TALBOYS.

HELMER E. ERICKSON. 

